Electric welding-machine.



UNITED STATES PATENT OFFICE.

LAGHL'AN MQKINNON, or BUFFALO, NEW YORK, ASSIGNOR 'ro MQKINNON CHAINCOMPANY, or BUFFALO, NEW YORK.

ELECTRIC WELDING-MACHINE.

Specification of Letters Patent. Patented June 10, 1913.

Application filed June 17, 1908, Serial No. 439,039. Renewed October 28,1912. Serial No. 728,267.

To all whom it may concern:

Be it known that I, LACHLAN E. MCKI NON, a subject of the King of GreatBritaln,

residing at Buflalo, in the county of Erie and State of New York, haveinvented a new and useful Improvement in Electric elding-Machines, ofwhich the following is a specification.

This invention relates to means for controlling the current flowingthrough the circuit in which the Welding electrodes are arranged in suchmanner that the welding circuit is interrupted periodically and" atgreater or less frequency, as the nature of the work may renderdesirable.

In the accompanying drawings: Figure l is a sectional elevation of amechanism embodying my improvement. Fig. 2 is a horizontal section inline 22, Fig. 1. Figs. 3 and at are elevations, showing different formsof toothed wheels.

Like reference characters refer to like parts in the several figures.

A B represent the welding electrodes of any suitable construction andarrangement, a b the conductors connected therewith, and C a source ofelectrical current connected with one of said conductors.

D E represent two contacts connected, re-- spectively, with theconductors a Z) and one movable with reference to the other so as tomake and break the circuit periodically. As shown, the contact D ismovable toward and from' the contact E by being mounted.

on a carriage or slide F which is movable between guldes f on asupporting plate or frame G. This carnage is moved in one direction by arotary toothed wheel H, and

in the opposite direction by a spring 6 connecting the carriage with theframe or otherwise suitably arranged.

The toothed wheel H, as shown in Figs. 1 and 2, is provided with acircumferential series of teeth, cams or wipers h which are removablysecured in sockets in in the wheel by set screws 1, so that thefrequency with which the welding circuit is closed can be regulated. Byremovingsome'of the teeth the periods between contacts can be lengthenedand by arranging the teeth more closely together the periods'areshortened. The teeth can be arranged on the wheel in such manner as thenature of the work may render desirable.

the size and shape of the articles to be welded, and the character andquality of the steelv of which the articles are formed, and thisfrequency may be greater during. one part of the revolution of thetoothed wheel than during another.

In the construction of the toothed wheel represented in Figs. 3 and 4,the teeth m are permanently secured to the wheel N but differentlyarranged on different wheels and the regulation of the contact periodsis effected by substituting one wheel for another. The teeth act upon asuitable projection on the carriage or slide, for instance, as shown, abolt or stud 0 which is adjustably secured in a lug p on the carriage.The toothed wheel is rotated by any suitable means from any suitablepart of the welding machine, for instance, by a gear wheel'g mounted onits shaft 1". The stationaryconin welding relation to the work toproduce an intermittent welding current, substan-' tially as set forth.

2. The combination with 'welding electrodes and the circuit in which thesame are arranged, of a make and break mechanism whereby the circuit isperiodically opened and closed while the electrodes are in weldingrelation to' the work to produce an intermittent welding current, andmeans whereby the frequency of the contact periods can be regulated,substantially as set forth.

3. The combination with welding electrodes and the circuit in which thesame are arranged, of a make and-break mechanism by which the circuit isperiodically opened and closed While the electrodes are in weldingrelation to the work to produce an intermittent welding current, andmeans whereby the frequency of the contact periods can be varied and thecircuit can be opened and closed at regular or irregular intervals,substantially as set forth.

The combination with Welding electrodes and the circuit in which thesame are arranged, of a make and break mechanism whereby the circuit isperiodically opened and closed while the electrodes are in weldingrelation to the work to produce an intermittent welding current, andwhich comprises a rotary toothed wheel, the arrangement of the teeth ofwhich is adapted to be changed for regulating the frequency of thecontact periods, substantially as set forth.

5. The combination with Welding electrodes and the circuit in which thesame are arranged, of a make and break mechanism whereby the circuit isperiodically opened and closed while the electrodes are in Weldingrelation to the Work to produce an intermittent welding current andwhich comprises a rotary wheel provided with removable teeth, and amontble contact actuated by said teeth, substantially as set forth.

6. The combination with welding electrodes and the circuit in which thesame are arranged, of a make and break mechanism whereby the circuit isperiodically opened and closed, while the welding electrodes are inwelding relation to the work to produce an intermittent welding currentand which comprises a stationary contact, a movable contact mounted on aslide which is movable toward and from the stationary contact, a

rotary toothed wheel actuating the slide in one direction, and a returnspring, substantially as set forth.

Witnessmy hand in the presence of two subscribing Witnesses.

LACHLAN E. McKINNON.

Witnesses:

EDWARD WILHELM, C. B. HoRNBEoK.

